Chemistry: analytical and immunological testing – Including chromatography
Reexamination Certificate
2005-01-04
2005-01-04
Ludlow, Jan M. (Department: 1743)
Chemistry: analytical and immunological testing
Including chromatography
C073S023350, C095S086000, C095S087000, C096S102000, C096S103000, C096S104000, C422S089000
Reexamination Certificate
active
06838288
ABSTRACT:
This invention relates to a modulator for use in gas chromatographic analysis, adopted for alternatively trapping and releasing fractions of solutes in a length of a capillary column within a chromatographic oven, characterized in that it comprises at least one nozzle placed to spray at least one jet in at least one corresponding place along said capillary column length, said nozzle(s) being connected each to a source of liquid CO2via a related valve, and means for alternatively opening said valve(s) for a predetermined time, to cause a jet of liquid CO2to impinge for said predetermined time on said column place and to leave the oven atmosphere to heat said column place after said predetermined time. The modulator can be used in a conventional GC system or in a two dimensional GC system, for modulating the analytes fed to the second capillary column.
REFERENCES:
patent: 5032151 (1991-07-01), Klein et al.
patent: 9821574 (1998-05-01), None
CAPLUS Answer 2001:389513, Beens et al., J. Chrom., A (2001), 919(1), 127-132.*
E.B. Ledford Jr. et al; “Jet-Cooled Thermal Modulator FPR Comprehensive Multidimensioanl Gas Chromatography” Journal of High Resolution Chromatography; vol. 23, Apr. 13, 2000, pp. 202-204, XP000986878.
Marriott, Philip et al; “Cryogenic Solute Manipulation in Gas Chromatography-the Longitudinal Modulation Approach”; Trends in Analytical Chemistry, vol. 18, No. 2, 1999, pp. 114-125.
Ludlow Jan M.
Nixon & Vanderhye PC
Thermo Electron S.p.A.
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